Feed reversing mechanism for sewing machines



Feb. 18, 1936. s. Asz ToczY FEED REVERSING' MECHANISM FOR SEWING MACHINES Filed Dec. 27, 1934 INVENTOR STEPHEN ,46Z706ZY BY ATTORNEY Patented Feb. 18, 1936 UNl'l'ED STATES P ATENT ()FFEQE FEED REVERSING MECHANISM FOR SEWING MACHINES Stephen Lasztoczy, Bergenfield, N. J assignor to Freydberg Bros. Inc.,

New York, N. Y., a cor- 2 Claims.

My present invention. relates to sewing machines and particularly to improvements in features of the feed reversing mechanism for sewing machines disclosed in Patent No. 2,005,656.

In my said patent, I have disclosed feed reversing mechanism for a sewing machine having a drive shaft and a feed controlling eccentric mounted on said shaft with a rod extending into the shaft and means on the eccentric and rod for shifting the position of the eccentric sufficiently to reverse the direction of operation of the feeding mechanism when the rod is moved. The means for accomplishing this reversal of the feeding mechanism is shown in my said patent as comprising a lever connected to the rod in such manner as to permit rotation of the rod relative to the lever, and an electro-magnet adapted to move the lever to accomplish reciprocating movements of the rod for reversing the direction of operation of the feeding mechanism.

In the present invention these features are unaltered, and the improvements relate primarily to means independent of the. electro-magnet for moving and maintaining the lever, which actuates the rod and the eccentric, into a position to establish the direction of operation of the feeding mechanism in a constant or single direction, so that the machine embodying the invention may be used the same as any ordinary one way feed sewing machine.

Another feature of the present invention resides in improvements in the member actuated by the electro-magnet for moving the lever which reciprocates the rod relative to the eccentric, and

particularly wherein said member has a positive non-frictional guided movement unaffected by variations in the fluxes in the field of the magnet.

The foregoing objects and advantages of the invention will be better understood and pointed out, during the following detailed description of the accompanying drawing, in which Fig. 1 is a perspective View, similar to Fig. l of my said patent, and showing the actuating mechanism for the feed reversing means including the electro-magnet, lever, locking means therefor, and connection of the lever to the reciprocable rod; and

Fig. 2 is a side elevation with parts broken away and partly in section, similar to Fig. 2 of my said patent, omitting the mechanism within the head of the machine.

Referring to the drawing, the numeral l indicates the usual casing of a sewing machine which encloses the parts shown and described in my said patent, including the said eccentric and con.-

nesting rods for actuating the direction of feed of the feed dogs, not shown in the present application.

The numeral designates a tubular shaft, similar to that designated by the corresponding numeral in my said patent, which is mounted through the casing l, and which is driven by usual pulley 6 and belt 1. Extending through the tubular shaft 4 is the rod 2 3, corresponding to the rod designated by the same numeral as in my said patent, which actuates the eccentric operating the feed reversing mechanism. The rod 24 rotates with the shaft 4 and is also slidable with respect thereto as explained in my said patent.

The flange 40 of the pulley 6 is connected as by means of a screw 42 with a sleeve M which receives a tubular link 43, in the bore of which the outer end of the rod 2a is slidably mounted. A screw 44 is mounted through the link 43 and engages into an elongated recess 15 in the rod 2 5 so that the link 43 is keyed to the rod 24 for rotation therewith. A coupling i'l is connected to the outer end of the link 53 and is provided with a race and ball bearings 48 to minimize friction during the rotation of the link 33 relative to the coupling i'l, which is not rotatable. Another link 53 is pivotally connected by pin 54 to the coupling 41, and by pin '55 to the upper end of lever 56 which is pivoted intermediate its ends at 51 on a bracket or supporting frame 58, in the present case, shown as a part of or secured to the electromagnet support or housing 59.- The upper end of the bracket or extension 58 is provided with a recess receiving one end of a coil spring 65, the other end of which is seated in a recess 66 in the lever 56 above the pivot 51 normally urging the upper end of the lever 56 outwardly to maintain the rod 24 in the position shown in Fig. 2.

The foregoing construction and arrangement of parts is substantially identical with that in my said patent, and, furthermore, as in my said patent, the lower end of the lever 56 is provided with a screw 13, having threaded on the outer end thereof a nut 14 to lock the screw in adjusted positions. The outer end of the screw abuts one end of a small lever 15 which is pivoted at 16 on an extension ll provided on the lower end of the lever 56. The other end of the lever 15 is connected to a rod 19 which extends through a boss on the 50 lower end of the lever 56, and the inner end of the rod 19 abuts a portion of the outer face of the support 59. Obviously, the screw 13 may be adjusted to move its head or inner end relative to the actuating mechanism operated by the electro- 55 magnet, presently described, to move the rod 79 through movement of the lever I5 toward or away from the frame 59, thus controlling the amount of possible movement of the lever 56.

The support 59 is composed of a two-part casting, each having at its forward or outer end, a rib 8I between which are located spacers 82, and a bolt 83 is mounted through said ribs and spacers and has secured on one of its ends a nut 84 holding the two parts together at their forward ends. Similar bolts 85, receiving nuts 86, are mounted through ribs 81 at the rear of the castings, and the ribs 87 each has a flange 88 through which are mounted bolts 89 which engage into the casing I of the sewing machine to secure the support 59 rigidly in place. Each of the ribs 8I and 81 is provided with a horizontal flange 90 providing tracks or guides for rollers 9I which carry the core 92, being connected thereto by pins 93 on which the rollers are journaled. The core 92 extends through the electro-magnet EM which is housed between the parts of the support 59, and is preferably enclosed by removable cover plates 94 secured to the castings by screws 95. The forward end of the core 92, designated by the numeral 96, is alined with the screw I3 on lever 56.

As in the case of the apparatus shown in my said patent, when the electro-magnet is deenergized, that is, when the electric circuit, which includes the wires 91 and 98 which are connected with the electro-magnet and with a manually operable switch, such as that shown in my said patent, is broken, the spring 65 maintains the upper end of the lever 56 in the full line position of Fig. 2, at which time the rod 24 is urged outwardly to maintain the operation of the feeding mechanism in a given direction. However, when the electro-magnet is energized, that is, when a circuit through the wires 91 and 98 is completed, the core 92 is moved outwardly, pushing against the screw I3 and moving the lever 56 to the dotted line position of Fig. 2, moving the rod 24 inwardly and effecting a reversal in the direction of operation of the feeding mechanism.

I have found that the provision of the positive guides for the core, that is, the anti-friction rollers 9| on the tracks 90 provides a uniform or even movement to the core regardless of the fluxes created in the magnetic field, and facilitates the operation of the lever 56.

Another feature of the present invention resides in the means for selectively maintaining the lever 56 either in the full line position of Fig. 2 or the dotted line position thereof for constant operation of the feeding mechanism of the machine in either direction. This means comprises a lever I00, mounted through sleeves IN on the upper portions of the ribs 8!, the lever having an arm I02 alined with the lever 56 and engageable therewith below the pivot 51. When the handle of lever I00 is in the full line position of Fig. 1, the arm I02 is retracted and the lever 56 is in the full line position of Fig. 2. However, when the lever I00 is turned toward the lever 56 to the dotted line position of Fig. 2, it swings the arm I02 against the lever 56, swinging it to the dot and. dash line position of Fig. 2 and driving the shaft 24 inwardly. As long as the lever I00 remains in the full line position, and the electro-magnet is deenergized, the feeding mechanism will operate continuously in one direction. Also so long as the lever I00 is left in the dot and dash line position of Fig. 2, the lever 56 will be maintained in its dot and dash line position and the feeding mechanism will operate continuously in the reverse direction.

I claim:

1. Apparatus for quickly reversing the feed mechanism of a sewing machine while the machine is operating comprising a member operatively associated with said mechanism, a lever to move said member, means normally urging said lever in one direction and adapted to maintain said lever and member in a predetermined position establishing operation of said feed mechanism in predetermined direction, an electro-magnet, a core movable by said magnet against said lever to shift the position of said lever and member and reverse the direction of movement of the feed mechanism, and manually operable means engageable with said lever to move it in the same direction as said core moves it and to maintain said lever in said reversed position independently of said electromagnet and core.

2. Apparatus for quickly reversing the feed mechanism of a sewing machine while the machine is operating comprising a member operatively associated with said mechanism, a lever to move said member, means normally urging said lever in one direction and adapted to maintain said lever and member in a predetermined position establishing operation of said feed mechanism in a predetermined direction, an electromagnet, a core movable by said magnet against said lever to shift the position of said lever and member and reverse the direction of movement of the feed mechanism, a support for said electromagnet and core, rollers carrying said core, and

tracks provided on said support for said rollers, and a second lever mounted on said support and selectively operable independently of said electro-magnet and core to move said first lever in the same direction as said core moves it and to maintain said lever in said reversed position independently of said electro-magnet and core.

STEPHEN LASZTOCZY. 

